18991431

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1$

素因数の和:228

約数の個数: 48

約数和(自身を含む): 31449600

約数和(自身を除く): 12458169

約数列:

[1, 3, 9, 17, 19, 47, 51, 57, 139, 141, 153, 171, 323, 417, 423, 799, 893, 969, 1251, 2363, 2397, 2641, 2679, 2907, 6533, 7089, 7191, 7923, 8037, 15181, 19599, 21267, 23769, 44897, 45543, 58797, 111061, 124127, 134691, 136629, 333183, 372381, 404073, 999549, 1117143, 2110159, 6330477, 18991431]

約数ペア:

[(1, 18991431), (3, 6330477), (9, 2110159), (17, 1117143), (19, 999549), (47, 404073), (51, 372381), (57, 333183), (139, 136629), (141, 134691), (153, 124127), (171, 111061), (323, 58797), (417, 45543), (423, 44897), (799, 23769), (893, 21267), (969, 19599), (1251, 15181), (2363, 8037), (2397, 7923), (2641, 7191), (2679, 7089), (2907, 6533)]